Add LinkedIn link (#427)

Author: wfouche

docs/userguide/ROOT/pages/index.adoc

@@ -262,4 +262,8 @@ https://bsky.app/profile/tulip-ltt.bsky.social[@Tulip_ltt]
 
 YouTube::
 
-https://www.youtube.com/@Tulip_ltt[@Tulip_ltt]
+https://www.youtube.com/@Tulip_ltt[@Tulip_ltt]
+
+LinkedIn::
+
+https://www.linkedin.com/company/108187552/admin/page-posts/published/[@Tulip_ltt]